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It started with the PAW Patrol at Katie's Pet Parlor, getting their teeth brushed. Ryder and Katie helped the pups out, and right after they were done, the pups showed their bright, clean smiles.
Meanwhile at the Dino Wilds, Rex was showing Taylor Turbot and Benny something amazing, a geyser called Old Reliable. Rex explained that it has been blasting an hour for like ten thousand years. After the geyser stops blasting water, everyone heard a rumbling sound coming from the trees. As they were looking around, they discovered some trees chopped down. Then suddenly, they spot a baby Stegosaurus and two were about to fall onto him. Rex told him to watch out and the baby jumped into a deep hole, and the trees fell and blocked the entrance. Rex, Taylor, and Benny, found him trapped and began to start moving the trees, but they were too heavy. Then, Rex started to call Ryder.
Back at the Lookout, while the pups were looking at their clean teeth, Ryder got Rex's call about the baby Stegosaurus, and Ryder said they're on their way. The PAW Patrol boarded the Dino Patroller and drove to Jake's Mountain,through the tunnel, pass the waterfall, and reached the Dino Tower, where Rex is waiting. As the pups got geared up, Ryder told the pups about the baby Stegosaurus trapped in a hole by trees. He hired Rocky and Rex to use their vehicles to move the trees out of the way, and Skye to use her plane to lift the baby out of the hole. As everyone was ready, they drove and flew of to save the baby Stegosaurus.
As they were getting close, they saw the trees chopped down, and Rocky saw some teeth marks on them. As they arrived, Taylor was happy to see them. Rex told the baby to hold on tight. He and Rocky began to move the trees out of the way. Rex used his dino claw to pull one tree, while Rocky use his truck's grabbers to pull the other. And after the entrance was opened, Skye lowered her plane's harness to help lift the baby out. Rex told the baby to get to the harness. And right after he got buckled up, Skye lifted him out of the hole.
After the baby Stegosaurus was saved, a big roar came out of the trees, frightening everyone. Skye put the baby back on the ground, and he ran off to find his mom. The roar is getting closer, Rex says it's coming from a Tyrannosaurus Rex. Ryder asked Skye to find it in the air. Skye had found the T-Rex, biting and chomping down trees and rocks, everyone knows that a T-Rex is a carnivore (a meat eater). The PAW Patrol needed to find out what the problem is as they drove off to it with Taylor and Benny joining them.
As they got close, Rex said that the T-Rex said it's mouth is hurt. But, he didn't know why he keeps on biting stuff. Ryder asked Skye to get a closer look to its mouth to see why it hurts. Skye used her goggle visor to zoom in, and she saw a tree branch stuck between its teeth, the T-Rex was trying to get it off by chomping on things. Luckily, Rocky reminded Ryder how Marshall got his teeth really clean, a stream rinse of water. Ryder called for Marshall to bring his water cannon to help the T-Rex.
As the PAW Patrol were following the T-Rex, they saw the baby Stegosaurus had found his mom. Marshall arrived and Ryder asks him to spray water at the T-Rex's mouth to get the branch out. The T-Rex was still feeling the pain in its mouth, it began chomping on rocks. Marshall wasn't high enough to reach its mouth, he needs to go higher. Then, a rumble came from the ground, the geyser was about blast again. It gives Ryder an idea, he asked Rex to communicate with the T-Rex to turn towards Marshall, and Marshall stand on the geyser on his vehicle to get more higher to reach the T-Rex's mouth, so he could be able to get the branch out. Marshall was below the geyser hole, and Rex told the T-Rex to come to him. The T-Rex followed him to the geyser, and as it was close, the geyser blasted water again, giving Marshall a better height. Marshall sprayed water into the T-Rex's mouth and got the branch out, making the T-Rex's mouth feel better. The T-Rex gave Marshall a happy roar and said "thank you."
Back at the Dino Tower, Taylor and Benny gave the PAW Patrol their congratulations for saving the baby Stegosaurus and the T-Rex. And, Ryder told her, "Whenever you have a dino-sized problem, just yelp for help." And, Marshall added, "And don't forget to floss." And the show ended with the T-Rex showing us the biggest, brightest, cleanest ever.